Mayo Clinic Q and A: Canker sores often go away on their own, …
https://newsnetwork.mayoclinic.org/discussion/mayo-clinic-q-and-a-canker-sores-often-go-away-on-their-own-are-not-contagious/
WebFeb 21, 2020 · Canker sores, also called aphthous ulcers, are small, shallow sores that develop inside the cheeks, at the base of the gums, under the tongue or in the back of the throat. Typically, they appear red around the edges and gray in the center. Although they don't always cause discomfort, canker sores sometimes can be painful.
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